I was lucky enough to get my hands on a beta set of Brandon's newest design.
https://www.rcgroups.com/forums/show....php?t=2321373
These are pretty cool and I could not wait to strip off my bench built aluminum mounts and strap these on.

Very clever, simple design is super strong and about as light as I think you could ever make a reliable bracket.

The main plate, it's clamp plate and the screws assemble in minutes without any disassembly, add virtually no weight and provide a strong, rock solid mount for your servoless retract assemblies.
They fit the F550 frames crescent shaped cut outs and bolt through the lower frame into the arm.

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